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Full text of "Text Book Of Mechanical Engineering"

Appendix II.

Then, in a 3 : i system, say :
PI= P2(i + ) ...... P2= P3

Adding each side"*:

or     Pa -   ^ (P2 + P3 4- P4)
But since all the rope tensions together = W

873

......(i)

and    Pj =  P4+wW

O          i<3         3O         4-O         So        <>         70         80         9.

Again, multiplying sides together in (i);
P4 (i
and

P2P3P4

(3)

Substituting this in (2

pi

1

/         ^3
(n-;/z3

/        \      V

or    P1(i-,7_i_     =
H       (r+0v

for a 3 ; i system......(4)

or generally

~



*  Plf P2, P3 are the rope parts taken in order from P to W.    See Tig. 4.39,